[docs] [issue23156] Remove tix install information in tkinter tix chapter of doc

Change by Terry J. Reedy <tjreedy@udel.edu>: ---------- resolution: -> fixed stage: patch review -> resolved status: open -> closed title: Update tix install information in tkinter tix chapter of doc -> Remove tix install information in tkinter tix chapter of doc versions: +Python 3.7 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue23156> _______________________________________